Nephrology · ICU and Critical Care · Internal Medicine
Free Water Deficit in Hypernatremia calculator
Enter the published formula inputs below to calculate and interpret this score.
Clinical inputs
lb
Allowed range: 22.05–440.92 lb
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fraction
Allowed range: 0.4–0.7 fraction
mmol/L
Allowed range: 120–200 mmol/L
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mmol/L
Allowed range: 120–160 mmol/L
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Result
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Clinical inputs
- Body weight (kg)Accepted range: 10 to 200
- Estimated total-body-water fractionAccepted range: 0.4 to 0.7
- Measured serum sodium (mmol/L)Accepted range: 120 to 200
- Target serum sodium (mmol/L)Accepted range: 120 to 160
Primary source
Adrogué HJ, Madias NE. Hypernatremia. N Engl J Med. DOI: 10.1056/NEJMra070613. PMID: 18184962. Scope: free-water deficit (L) ≈ total body water × (serum sodium / desired sodium − 1) for hypernatremia; total body water estimated as weight × an appropriate water fraction. (2000)
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